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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956333aa946e15e2abe82e385d6bffe9aca12085c6bdae2985e4ed076d4e6a8a' 
  AND token = 'D8Oz3Be/jK2cxEpr8s1l2cA9gi9tDCyAm2V01gbZVjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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