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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1946b449b697aa8d04cab97c7be5a791217e2da86452193bd37fe23a0a50552' 
  AND token = '/hyfti+kJm5/Ld46r6IS0U3/lQ+cOuzBmkqoGYgTye4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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