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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30bbc7065306e21209e818740b1aa8b1334ebeead87327bee0393b84fd66d110' 
  AND token = 'uRsWW/WO7KURpRw2Ba+kiSkD97kWwRvB7mAR4I21qGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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