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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf6d35ba67b8482aa4142967095454dc926ab6df2615910d24d7aaf5f5dd8de' 
  AND token = 'alhBRTNXl4R1BwcQQc3JWCMWEh+A35e5j43O+59o73o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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