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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b919df4edbbed7e3caf960be459de7f4e958f91d55ffb00afcd7a24d1e743110' 
  AND token = 'MUHQg8/R34qi8etyM4Y6eM+EwVH0QbSG5uD2n8XQTY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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