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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012e5d202e2f457490b2f3c9ede437a8b797a463210cf39ca4ee7d879bce6d33' 
  AND token = 'TbWICadUErGWDsrYNbpFcjmgMwbocvv66EMaHXhZ7DE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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