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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2952bbe6985245b3849a9ad3df42df43aa5a647be199528f02d10da6aef5f00' 
  AND token = '2DhNofl4s2EkCb4Z0F3HNN6BX4wM76Ubpa3jCxpt50U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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