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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f05e973f3de9cd52c0db64db1897b1db5dc5d00fcb816468ad504d5f7595c108' 
  AND token = 'eKoTlRuh7dRw4oFy8Mlp9YeyifKqlUteLN5GoFALcLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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