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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9e6c37e7a6276b9e8677249b44fa7e69b0e2f0be16df2ba3f5d34584edcc503' 
  AND token = 'd5Z9SCNh9V7mwXCRdQyNAErEj4klK+JoAKidCCdxyMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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