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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91cdf96ec9d840e7133459a42e26cfa2087761a406cf3ae1d923bd4d2565e76c' 
  AND token = 'nwgWFzVBBvT2pPIFmvUJUkykdpoaxkQIxAAvf9tJ+ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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