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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89491ac77df453af129bb42c474aea16a23f89fb52b5787ef9b11175f0d191de' 
  AND token = '+Lq+7qdsKc9GKhy5NGNmH7+C4NBZ8QBmz7m6ZMoQBQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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