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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b90c6b5883fa2569e9253ad53ea5903def610e69fa192077997ff4a2c35f524' 
  AND token = 'vfmT4OygQ+CPHlpyQXLalyO2+3b58Ksl2DIPI4fQ3Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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