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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce48fddab721ef5694910ea1c63827ed21345e69ae8a7b96401f136cd4c8adb5' 
  AND token = 'boE9hVvuFDUnGLchlwOp1y2IPsuk4tAnGXYpP19OBm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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