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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ab4a246f8544f0d737097789f690449d60e841bad2196b886d25174b3fdc4d' 
  AND token = 'yGwnzZjBkFDZ/jBsiZbsDbrObj4FNdT/cGSp5xIzuTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00171

JSON explain

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