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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '477269bbbbc53bb4ac03ea25a3ff3b82adfac31fa94d773d084776de4af5d20a' 
  AND token = 'JGRhzFeOPsF7yoDom/pUQegUARbSs5GB8a5q0544kO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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