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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf05230f38961628b350fdf797b1caf6dea510358571e109ba184b97199bd115' 
  AND token = 'PqsbwruJxvk0MfM3mfxcMEJNQV6ljMznoLzFytz4t38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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