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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6c2d3f5b3985be3acb8822a7653eb56ae50d44fc0cd088aed10e3a8eb35e0f' 
  AND token = 'c8R40O3JAlK41l00/iv5ZS+hGkLNSUbvmWBLVkbjAzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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