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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8b3e781b3c937a6995e3ebce852448a30b06a48d829e202534812f90d9390d' 
  AND token = '56+ho7dT3J2/Az6DaiN2qevckCH544JyQGQT+KX8EJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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