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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cae1add0a31176143fee6b0687832cc86be098b8f2a701eb9139b05eb165ef8' 
  AND token = 'lvPGy40C0dcaXo1EpuemJr82dyqIOwYP6ohPxapJ2vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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