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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efba5f374168aa1f157432539531c2fe9cd151ec3c2052ee6d84e2fc6e9fe24' 
  AND token = 'ZGO1/GvN9Hp1fzbmMv+eeJ4RuC2iWpdx8s0hdiASbn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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