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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05bb6b4b9489b85a90b72efc7ab7a09a20f86da800f8461c44598008b763892f' 
  AND token = 'TpMQuVjPBQfW/CosPOZjFpaquty55IN+Ar8xobYiB2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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