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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f182481725d815c8ea616ac9e24c24af5daf02c29d38a1ef520f7e86cfd628' 
  AND token = 'mTRY/7K67SdCKmp54cjvvRVzDTLpHeRC9i2OhYiiBys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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