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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c1af557c644d130f9e1523afad70d44e9a6c3f4f8f8c60e421e2dc1cc6be3a' 
  AND token = '4pbJzCfNiLH6+6vKVbw9TdRmANpHwAXeJK1VwYA9hgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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