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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea626e6e9a73e5d82c7f298566d4a41a28343b82b3439c283ab049283664e384' 
  AND token = 'gpMYJ/aUGN+eyTEZDiWi8ea94/AnXyfl6kq6xX5Byyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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