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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58ec427f9a53fca41d6314ac9272bd8af2133364a79351adcaab3df9c6c428a6' 
  AND token = 'ISox1A0KMkDqogtveAh1gwltnFwfjZbdgPkfMQJ4TXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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