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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15c361e994b4cd89d1bb9ba50bab7b84d0c947ac5dba9c96560082b258c9fda' 
  AND token = '1z3H5HDkXM1UCWB+xfsZJNoTCrdYaPKaMETKPjQ9fGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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