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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d15d6c95146ab04efb7b1f162056b8662e6ed6114973d7d1ca2ce59146a9d8' 
  AND token = 'aSqUZvQg10ENMws/NXQ9txCbJ34U7mlDzEhG5CQtsGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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