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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb8d958884a8ee61a8a2ec6049155f5342f1dec0d84231f590aa60fb51d6d79' 
  AND token = '/HqlP3QxlvpzKxwNFshlY54ZrbyaDKHJHnRu/EaDNR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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