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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf79dd3e6791956242a24e8294e99dd2dd48d7f4c703df7b2c21c420ed1b750' 
  AND token = 'C/s+8NFNcZ7f0t4ERThTi7cbouHvSfMQBPEM9onv2wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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