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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0bc034b1bcbefd6b9377253a62242d9ba508214a2cacd9a7d35cd4466de257' 
  AND token = 'n69snuIvutlpGRAhWtrLGwWszZ0zogKKU2/sAyz7w1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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