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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35071bc607c4a33b5efdaff7f0793c3c73d9322cf672441cd15a2e03cd1eca7c' 
  AND token = 'rTBoZ53wWdJTMT7NJmJjZj5doWh54sNefZVOW5pMwI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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