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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564a244053c3a34b773bc75e263547f4ef53ba0e43a38c7384cfac10c55569bd' 
  AND token = 'anBGI7bq8MrK5ZnP5cFdh3b4reVQpHgv9hOScxxo4ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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