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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf8de5f83239956a15c9ab0f8e5baf86e5617a0e0eca744d0570ca24760bbfe' 
  AND token = 'A/hErUjv4eb3uonHqFsismShaXAC2dpKVEh47GnFzbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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