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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19723a2a193c70892d82a7c849a83d7ad84211444654306ae7de4c4bc9026f52' 
  AND token = 'byy73NgV9hLUKe7yj5/2dA9akbIk4/TpU1Q2nx97Heg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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