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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a91c3b0b2747fc56971156eba6a8155c67ac967beb2a73b89c46f61d21c6bd' 
  AND token = 'dHrZy5KED5U2bQjuVsPTmRY0Rj98+ZJkKsvtV4aRwXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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