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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac199741a40279a1165feea501f6f5cd5aa8a5a22868b6d3007b046f65d4a28' 
  AND token = 'Zqe7abUi0phiIKaIjDmrzx0carLKsZPX+ZdDutn4QMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00201

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}