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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab8a1a737467658a8a81c69ec33ea68ae081fc15a284ab931e195a8f34f17a96' 
  AND token = 'JboGajZRoWt4Oy7Yaoa0y+2QJ/zyB3ZJw2/w5Sspd6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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