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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a9f5203cc11a5c00efe593cd8c67bfcec923c15b69d41deb6d08cd21e16809' 
  AND token = 'wZ2w7XauUyXLKe/jOfdjvSCi1gk9y42+mgxFb3Ptq0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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