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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84411ced9fd06790a443325e9c87b945509522c2bcd415f752a7061df066e14a' 
  AND token = 'HhDgwyov+abaKu+cPU3+9i+vHGIJ0JZx2UrFeIJl+8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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