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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073611cd557d032636cb9e4f7d51c760d037d1550c7046b0c488a063bfb07d7e' 
  AND token = 'mKDD+EwLcbMj04VjM9q6EuFyf3gEUkDkT/JJ2TFd5KQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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