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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de83f7932929c3970bf45bd26ff1ceacb8a14e628190825f78263ea91e39ba0' 
  AND token = '55OKD9yuYcxkysLGWxIo1tIVM3KCshs8JP6yufYLekM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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