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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fb04d5f7a3cf6605b61f02199beec58d590e76263496248dabf333c1c0e66b' 
  AND token = 'evbWARFwJfHa0dWL6iayR0wp/AndztTvQubeyf0iwFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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