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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d62f7e94092653c29f4f085e7f9022f8b26da433d83d0e0720e9b610de4ddab' 
  AND token = 'DbpZ29ZxaVwTkCe2FjY4NjD212QwZxP3HXTYt+Sx0Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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