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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd00187e1b534c5c7226d8d82bba66c5a568a20c4be41acc19dd761803417a38f' 
  AND token = 'ZHiF9UA2ExIQeJ/WR2Vy3btig5HK2dj7BMWV/wfjQHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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