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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a990ed31a1eacf2bafbb1d463de988e5a64f5293ab74040115b358409f031b58' 
  AND token = 'O0fCM8qYGwKUTgYBUtkd9EH1+ECsbQhN248kFATAfMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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