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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4629e160cca46d00a2a6018e22113c0f3e3097cd4f8ac8e3f7949ad0afe5ae62' 
  AND token = '3Na/ZYpGuf6SH33TcSj0cdMBkTPVLzE9Xmf3BoPAzaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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