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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9b4e330a2e2daa5c149338578669d24a88ff929bc4b7fb5fc956f0cafb7dc1' 
  AND token = 'OiZwbjAK3FM8SWTkSGlTNvuxk7V74nc8y7bj6YwUGQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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