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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c4f67cef8d4e9dd0406586d230d5339f04137a747de657bc57bc244dc86e41' 
  AND token = '4FHtsWJCXx/B271bbwITfAK6wpj7Fn/vnafBoal4dN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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