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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '671b3e44ec419790133f7e94f821fb63decef4e53ee029552fbd485efb321d41' 
  AND token = 'Piw9ozk52IcPYVQvkbPVYjPzNRZO+A4IVWQ2K1Z4JcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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