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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd74c791058fa91a7575e0d03d20f12330bb7213fcf09aa0fa7013fab613b53d1' 
  AND token = 'nh93bbDKYgFhgeuDxP21JIGaT+LwHHzZEi/RoK8zcaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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