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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04913eb6eabae4b7d71dea0d5ac89a027a621ea1840972a2aa99f528aa8a7ee9' 
  AND token = 'Vnx6wR3LnvQ6SYd9QQ0IcX9z+6q5Qguw1hp9gsSp4WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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