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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a791205d606c0c3b1ca8b7c1bc70542f4e58de08a5a164b34690be597a8720ea' 
  AND token = 'kpHkxqNGGk9LfursQPXNVdkEbJ/s2ZN62izQuuJ8W9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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