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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a392d00a1a3c65dc2964c41043b3cf1e2c47056c98150d0f01532eca5caaf734' 
  AND token = 'Es8DrkXyBdEhMA5/tkj6jES1o45NHh7A8vIEkh4pgGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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